Dear Amy: My friend “Jennifer” and I moved into an apartment together last year. We are both on the lease.

At the outset, we agreed that if we wanted to have boyfriends – or other guests – stay regularly overnight, we would limit this to at most two times a week.

I have a boyfriend and have adhered to this agreement. I frequently work from home and it is important for me to live in an environment that is fairly quiet and peaceful.

Jennifer’s sister lives nearby and for the last two months, this sister has spent five to six nights a week at our apartment. She says this is because her roommate’s boyfriend has started staying over at their apartment. Plus, our apartment is just nicer than hers is.

I enjoy her company to a certain extent, but when the two sisters are together, they tend to be noisy, messy, and – it’s just disruptive.

I’ve talked to Jennifer about this and she seems unwilling to enforce this rule with her sister.

At this point, I feel exhausted and stressed by this situation.

What do you think I should do?

– Roomie

Dear Roomie: You and “Jennifer” talked this over when you moved in together (a very smart move on your parts), and she agreed to this limit on sleepovers.

You should check the language on your lease (many leases prohibit others from essentially moving in), and discuss this calmly and frankly with both women.

Jennifer’s sister understands the pressure of living with an “extra” person because her roommate’s boyfriend has driven her out of her own home.

The two sisters might want to look for their own place, but starting now they should agree and adhere to the house rules that you two established when you moved in together.

You can email Amy Dickinson at [email protected] or send a letter to Ask Amy, P.O. Box 194, Freeville, NY 13068.